In a standardized test administered for all 6th graders by the Arizona Department of Education Jill s score in reading comprehension is reported as 78th percentile What does it mean Jill can read 78 of words in the test Jill s score in reading comprehension is 78 78 of all students who took the test scored the same as or below Jill s score 22 of all students who took the test scored the same as or below Jill s score O Jill answered 22 of all questions correctly